Russia imposed financial sanctions on Ukraine’s political elite on Thursday, freezing the Russian assets of hundreds of politicians and officials along with dozens of businesses owned by Ukrainian businessmen.

The sanctions were set out in a decree signed by Russian Prime Minister Dmitry Medvedev and were described as counter-sanctions drawn up in response to similar Ukrainian measures against Russian citizens and companies.

The decree said 322 individuals and 68 businesses were targeted, including President Petro Poroshenko’s son Olexiy, presidential contender Yulia Tymoshenko, the head of Ukraine’s SBU security service Vasil Hrytsak, interior minister Arsen Avakov, and billionaire tycoon Victor Pinchuk.